John w



(No Model.)

. J. W. MARK. I GLASS FOR LIGHT TRANSMITTING AND VENTILATING.

No. 458,854. Patented Sept. 1, 1891.-

UNITED STATES PATENT OFFICE.

JOHN IV. MARK, OF NEIV YORK, N. Y.

GLAS S FOR LIGHT-TRANSMITTING AND VENTlLATlN G.

SPECIFICATION forming part of Letters Patent No. 458,854, dated September 1, 1891.

Application filed April 21, 1891. Serial No. 389.820- (No model.)

To all whom it may concern.-

concave faces may,broadly speaking,be con- Be it known that I, JOHN WV. MARK, of New sidered as openings or passages extending York, in the county of New York, and in the obliquely through the plate of glass; or, to State of New York, have invented certain new describe them differently, each may be conand useful Improvementsin Glasses for Lightsidered as composed of two triangular-shaped Transmitting and Ventilating Purposes; and cavities opening in both a horizontal and a I do hereby declare that the following is a. full, vertical plane. clear, and exact description thereof, reference The shape which I have given the protu being had to the accompanying drawings, in berauces or offsets is most advantageous, as

10 which it enables the formation of openings of con- Figures 1 and 2 are perspective views of siderable area without incurring any likelimy glass from opposite sides; Fig. 3, a vertihood of inward passage of rain. The latter cal section thereof, and Fi 4. a horizontal is particularly well guarded againstbyhaving section on the line a: 00 of Fig. 3. the edges of the offsets that stand away from 5 Letters of like name and kind refer to like the surface of the glass in the same horizontal parts in each of the figures. plane, and this construction also prevents the The design of my invention is to construct direct passage of strong drafts of air.

a glass for use in the risers of outdoor r eX- I have shown my ventilating devices as arposed stair-ways or in other vertical or upranged on the two diameters of the glass Ain 2 right situations, having provision for ventipairs and dodged or staggered but of lating purposes, which, while affording adecourse, if desired, they may be differently lo quate admission or passage of air, will nevercated and relatively arranged and more or theless not permit the entrance of rain or less than four be provided in one glass. snow into the space or compartment to be Having thus described my invention, what 5 illuminated and ventilated. I claim is- To this end said invention consists in the 1. A glass for illuminating and ventilating glass constructed substantially as hereinafter purposes,having a hollow protuberance or oilspecified. set standing away from its surface and form- As shown in the drawings, my improved ing a laterally and downwardly opening ap- 3 glass consists of a preferably rectangular or erture, the part of said offset bounding or de- 8o square plate or sheet A, in which are four finingthe downwardly-openingportionof said similarly-shaped ventilating or air apertures aperture being in such a plane that none of it a a a a. Each of these is formed by projectis above the laterally-opening portion of the ing from the opposite sides of the plateA aperture, substantially as and for the purpose 35 convexo-concave protuberances or offsets a specified. 5 and ta the former being on what in use is the 2. A glass for illuminating and ventilating outer or exposed side and the latter on the purposes, having an opening housed by an inner side. In shape these protuberances or overhanging portion whose lower edge is a offsets are the section or part of a hollow straight or substantially straight line in a 4,0 sphere,being substantially one-quarter therehorizontal plane, substantially as and for the 0 of, and their position relative to each other purpose set forth. corresponds to that of the diagonally-opposite A glass having an aperture formed by a quarters of a sphere, the outer one a being conveXo-concave protuberance oroifset whose in the higher plane and with its lower edge lower edge extends in a horizontal or sub- 45 preferably in the same horizontal plane as stantially horizontal line,substantiallyas and 5 the upper edge of the offset a The aperfor the purpose shown. tures a are defined or bounded by the inner at. A glass having an aperture formed by concave faces of the upper offsets a and the two offsets diagonally and rcversely arranged, outer concave faces of the lower offsets a the lower edge of the upper one being in the 50 and in view of the relative positions of these same plane as the upper edge of the lower roo one and each containing a cavity, substantially as and for the purpose described.

5. A glass for illuminating and ventilating purposes, consisting of a plate having an aperture formed by two convexo-concave offsets dlsposed one on the outer and one on the 1nner side of said plate, the outer one being in the higher plane, substantially as and for the purpose set forth.

6. A glass for illuminating and ventilating purposes, consisting of a plate having an aperture formed by two conVeXo-concave offsets disposed the one on the outer and one on the inner side of said plate, the lower edge of the outer offset standing away from the surface of the plate and the upper edge of the inner offset likewise standing away therefrom and the said edges being in the same horizontal In testimony that I claim the foregoing I 0 have hereunto set my hand this 16th day of April, 1891.

JOHN \V. MARK. \Vitnesses:

GEORGE SCHUCHMAN, CHAS. HINMETSBACH. 

